Ch. 15 Review

developed a theory of evolution based on natural selection

theory that evolution occurs in small, gradual steps over time

Which of the following is an example of a vestigial structure?

random effect that can occur when a small population settles in an area separated from the rest of the population

random change in allele frequencies that occurs in small populations

cumulative change in a group of organisms through time

shift of a population toward an extreme version of a beneficial trait

most common form of natural selection in which organisms with extreme expressions of a trait are removed

process in which a large population declines in number, then rebounds

occurs when a population divided by a geographic barrier evolves into two or more populations unable to interbreed

Almost every specimen Darwin collected was new to European scientists, though they were similar to species on ____

Darwin collected this type of specimen

Humans give birth at a much earlier developmental stage than other primates

states that allelic frequencies in populations stay the same unless they are affected by a factor that causes change

Darwin inferred that humans could change species by _________________

Anatomically similar structures inherited from a common ancestor are called ______________ structures

Biogeography is

Darwin's book "On the Origin of Species" demonstrated how evolution did NOT occur

change in the frequency of a trait based on competition for a mate

Natural selection is a mechanism by which evolution occurs.

____________ traits are newly evolved features

The theory of evolution states that all organisms on Earth have descended from a single common ancestor

Darwin has hired onto the HMS Beagle to be a ____________

The glyptodont was an ancient ancestor of the modern ____________.

diversification of a species into a number of different species, often over a relatively short time span

The more closely related species are to each other, the greater the biochemical similarity